This is unedited, straight from the phone's digital camera. (NB: you should click on these images to see the full uploaded size as the reduction for this blog post is producing some added compression artifacts.)
This is almost 1 MB in size. The limiting factor is definitely the tiny lens.
You can adjust exposure, and focus. The camera works well in low light. Auto white balance works well, too.
On the orange markers, you can see the red channel blocking up. But this is typical of most digital camera, even the digital SLRs.
This is result of PP in Nikon Capture NX2, which I use for the D90 DSLR. The image holds up well to sharpening: high pass and unsharp mask.
The color channels are not blocking up as much as I would expect.
I don't see major color shifts when darkening different areas such as the notepad cover.
All in all this 5 mpx image, even though it's a jpeg, holds up well to editing, but I think most folks will go to this extent for a phone cam image, and just upload it directly from the phone.